Sight



ion.

Patented Aug. 2o, 1946 UNITED STATES PATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 2 Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

This invention relates to a rear sight for a firearm.

The Windage and elevation adjusting knobs or dials of sights for most rearms are generally separated so that rapid adjustment for either elevation or Windage cannot conveniently be made. When the adjusting means are so separated the rifleman must frequently use both hands to make such adjustments. It is obvious that when the riileman has to use both hands to adjust such a sight the riile must be removed from the shoulder and such sights will therefore no longer be aligned with the target. Hence both Windage and elevation adjustments should be placed in juxtaposition on one side of the sight where they could be readily adjusted by one hand of the rieman and the rifle sights could then be maintained in substantial alignment with the target.

Accordingly, it is an object of this invention to provide an improved rear sight for a firearm having both elevation and Windage adjustments in juxtaposition for ease and convenience of adjustment thereof.

A particular object of this invention is to provide an adjustable rear sight for a firearm such as disclosed in my prior U. S. Patent No. 1,892,- 141.

Still another object of this invention is to provide a rear sight for a iirearm having Windage and elevation adjustments that will positively maintain any desired setting against displacement by firing or accidental shocks.

The specific nature of the invention as Well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Fig. 1 is a right side elevational view of the sight shown mounted on the receiver of a firearm.

Fig. 2 is a cross sectional view of Fig. 1 taken along the plane 2 2.

Fig. 3 is a longitudinal section View taken along the plane 3-3 of Fig. 2.

Fig. 4 is a right end elevational view of the elevation knob.

Fig. 5 is a side elevational View of the detent. Fig. 6 is a View showing the interior of the detent. f

Fig. 'I is a left end elevational View of the pin- Fig. 8 is a front elevational view of the pinion.

There is shown in Fig. 1 a rear sight for a rearm embodying this invention which comprises a movable sight base 20 adjustable laterally by a Windage knob 30 and a sighting member I supported by the sight base and arranged to be elevated or depressed by a pinion I9.

The elements of the sight are shown mounted on the receiver 2 of a rearm such as disclosed in my prior U. S. Patent No. 1,892,141. It should be understood however that the sight to be described herein can be readily adapted to any other firearm by obvious adaptations.

On receiver 2 there are provided two upstanding integral oppositely disposed pinion supports 3 and 4. A horizontal hole 5 is provided in each support 3 and 4 to mount pinion I0 and the windage knob 30, Pinion III comprises a shaft 6 and an integral cylindrical head portion I. A plurality of serrations .21 are provided on the left face of head 'I as shown in Figs. 2, 7, and 8 for a purpose to be described. Adjacent head 1 a reduced diameter portion 8 is provided which engages hole 5 in pinion support 3 in 'bearing relation. Pinion teeth 9 are provided approximately in the center of pinion I0 to engage corresponding teeth I8 0n sighting member I as will be described. The right end of shaft 6 adjacent the teeth 9 as shown in Fig. 2 is of reduced diameter to receive Windage knob 30 as Will be presently described.

Movable base 20 comprises a body portion I2 and two upstanding sighting member guards I3 integrally formed on the top of the body portion I2. A transverse hole II is provided in the lower part of body portion l2 to mount movable base 2U on shaft 6 of pinion Ill. The right end of hole I I in body portion I2 of movable base 20 is threaded to receive the end of Windage knob 30. An arcuate T slot I4 is provided in the center of body I2 of base 2D to receive the sighting member I. Sighting member I (Fig. 3) comprises an arcuate body portion I5 terminating in a vertical rounded end I6 in which is provided a sighting aperture I1. On the underside of body portion I5 a plurality of teeth I8 conforming in size and shape to teeth 9 are provided which engage pinion teeth 9 of pinion I0.

Windage knob 30 comprises a cylindrical knurled head I9 and an integral axial stem 2l. An axial hole 2.2 is provided in Windage knob 30 to mount such knob on the reduced diameter end of pinion I0. The right end of hole 22 as shown in Fig. 2 is counterbored as shown at 22 to receive a spring 29 for a purpose to be described. Knob 30 is horizontally mounted within hole 5 in support II. 'I'he end of stem portion 2| is pronui-un vided with exterior threads 2l to engage the threaded end of hole I I of movable base 20 to obtain lateral adjustment of such base.

To hold the sighting member I in any One of a plurality of positions a cup-shaped detent 25 is placed over the head 1 of pinion I0 and is secured thereto by a screw 24. The screw 24 passes thru a hole 26 in detent 25 and is screwed into a threaded axial hole 23 in head 1. About the inside of detent 25 as shown in Fig. 6, there are provided a plurality of serrations 4I which engage the corresponding serrations 21 provided on the face of head 1 of pinion I0. A wedge shaped detent 42 provided on the edge of detent 25 yieldingly engages any one of a plurality of serrations 28 provided on the face of support 3. Suitable elevation graduation marks 43 as shown in Fig. are provided on the outer periphery of detent 25.

A circular recess 3I is provided in the end of knob 30 to accommodate an elevating knob 32 secured to the end of shaft 6. Knob 32 is a cylindrical member provided with a beveled edge 33. The edge 33 is provided with serrations 34 to afford a non-slipping surface for manual operation of knob 32. A counterbored threaded radial hole 35 is provided in knob 32 to receive a set screw 31. The set screw 31 is provided with one end of reduced diameter which when inserted into hole 35 enters a transverse hole 38 in the end of shaft 6 of pinion I0 thereby locking knob 32 to pinion I0. A plurality of integral detents 39 are provided on the inside face of windage knob 30 concentric with respect to axial hole 22 and engage correspondingly shaped notches 40 in the pinion support 4 provided on the outside face thereof.

The spring 29 is disposed within the counterbored end of hole 22 and bears against the bottom of such counterbored portion and against the inside face of elevating knob 32. Spring 29 thus biases windage knob 30 against the face of support 4 and also biases elevating knob 32 outwardly away from windage knob 30 thereby bringing detent 42 forcibly into contact with one of serrations 28. Likewise one of the detents 39 on windage knob 30 will engage the corresponding notch 40 in the support 4. When windage knob 30 is rotated threads 2| on the end thereof engage the threaded portion of hole II and hence base 20 is laterally moved on pinion.

I0 in a right or left hand direction depending upon the direction of rotation of windage knob 30.

It should be mentioned that detents 39 on windage knob 30 may be so angularly spaced as to provide adjusting clicks when rotated in increments of one minute of angle of windage, or any finer or greater increments as may be desired. It is readily apparent that such windage adjustment is entirely independent of elevation adjustment of sighting member I as windage knob 30 surrounds pinion I0 in bearing relation.

Elevation adjustment of sighting member I is readily obtained by turning the elevating knob 32 to raise or lower sighting member I as desired. Serrations 28 on support 3 may likewise be so angularly spaced that increments of one minute of angle of elevation may be obtained. It should be appreciated however that greater or lesser increments of adjustment of sighting member I are readily obtainable by greater or lesser spacing of serrations 28.

The sightl herein described is readily Zeroed after the rearm on which suchsight is mountal 2 of graduations 43 come oppositea suitable index mark (not shown) on support 3 Without disturbing the lsetting of sighting member I. Knob 32 is released and screw 24 again tightened. The serrations 4I again firmly engage serrations 21 so that detent 25 will not slip with respect to pinion I0 and detent 42 will yieldingly engage serrations 2 8.

Sighting member I is firmly held against accidental displacement by the bias of spring 29 which holds detent 42 and detents 39 tightly against corresponding serrations 28 and notches 40 respectively. Hence the position of sighting member I will not be disturbed by the shocks of firing or chance blows.

Thus it is apparent that a compact, rugged and dependable sight is provided having both windage and elevating adjusting knobs in juxtaposition at one end of such sight for rapid and convenient adjustment by the rifleman and requiring the use of only one hand for such adjustment. Further, accidental displacement of the sighting member I is obviated by the novel construction of the sight herein described thereby insuring that any setting of such sighting member will be securely maintained until manually reset.

I claim:

1. A firearm sight comprising a pair of spaced supports, a hollow Windage knob journaled in one of said supports, an elevating pinion having one end journaled in said other support and the other end projecting thru said windage knob, an elevating knob secured to said projecting end, an annular cap having yardage graduations disposed about its periphery, means for securing said cap to said elevating pinion in any one of a plurality of angular positions with respect thereto, a sight base mounted between said supports and threadably engaged by said windage knob, whereby the position of said sight base may be varied transversely with respect to said supports, an aperture member slidably mounted in said sight base for movement along a path having a vertical component with respect to said sight base, and toothed means interconnecting said elevating pinion and said aperture member eifective to move said aperture member along said path by rotation of said elevating knob.

2. A firearm sight comprising a pair of spaced supports, a hollow windage knob journaled in one of said supports, an elevating member comprisng a head and a shank, said shank being insertable thru the other of said supports and thence thru the hollow portion of said windage` knob, the end of said shank projecting thru said windage knob, an annular cap having yardage graduations disposed about its periphery, means for securing said cap to the head of said elevating member in any one of a plurality of angular positions with respect thereto, an elevating knob secured to said projecting shank end, a spring operative between said windage knob and said elevating knob whereby said windage knob is forced against one of said supports and the head of said elevating member forced against the other of said supports, a sight base mounted between said supports and threadably engaged by said windage knob, whereby the position of said sight base may be varied transversely with respect to said supports, an aperture member slidably mounted insaid sight base for movement along a path having a vertical component with respect to said sight base, and toothed means interconnecting said elevating member and said aperture member effective to move said aperture member along said path by rotation of said elevating knob.

JOHN C. GARAND. 

